RE: MI maximum

[Gene_Gaunt@xxxxxxxxxxxxxxx]

Well I dug out microfiche (don't ask).  Version 0 program template has
maximum 8191 dictionary entries, instruction operands are two bytes.
Operand bits 3-15 hold a dictionary number 1-8191.  Operand bits 0-2 denote
the operand type:

000:  simple dictionary reference or null operand
001:  unsigned immediate value
010:  subscript, e.g.  ARRAY(INDEX)
011:  substring, e.g. STRING(INDEX:LENGTH)
100:  explicit base, e.g. BASEPTR -> DICTNO
101:  signed immediate value
110:  explicit based subscript, e.g. BASEPTR -> ARRAY(INDEX)
111:  explicit based substring, e.g. BASEPTR -> STRING(INDEX:LENGTH)

Version 1 program template has maximum 65535 dictionary entries,
instruction operands are three bytes.  Operand bits 8-23 hold a dictionary
number 1-65535.  Operand bits 5-7 denote the operand type.

By the way the template allows some interesting things that the QPR*
programs don't.  For example four forms of branch extenders can appear in
the template:

CMPNV(B) A,B / EQ(SKIP);   /* branch point form */
CMPNV(B) A,B / EQ(IPTR);   /* instruction pointer form */
CMPNV(B) A,B / EQ( =+2);   /* relative instruction number form */
CMPNV(B) A,B / EQ(123);   /* absolute instruction number form */

However the QPR* programs don't allow the 'absolute instruction number
form'.  Some OS/400 programs and development tools (SEU,PDM,SDA) used to
come with program creation templates.  When I ran them through my template
disassembler, I observed they used 'absolute instruction number forms'.  So
perhaps they weren't born through the QPR* process?

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